Simult sequence cut samples

Hi all,
When i use the feature of "simult sequence", the 2nd sequence has the samples that cut. Sounds like a polyphonie issue but it's not.
Anyone else have problem with that ? Could be a super feature but doesnt work in my case...

Out of topic but the explain of why i would like to use it, if anyone has any other solution... :
I have a brass sample loop that should start at the 3rd measure of the last bar (8).
But at least, i would like to ear it at the begining of the first bar when its the first time it plays.
Like : Bar 1 : Trump trump trump etc... And the loop has to start again at 8,3/4.
Any way to do it with with the mute in programm mode ? Seems doesn't work to target some chop has mute.
Like : Pad 01 = Sample 3 chop 1, Pad 09 = Sample 3 chop 1 and mute target for A01 is A09. So if i record a track with A09 only at the begining, and on an other track when A01 play at 8,3/4, A09 should not play.
But no, it plays...

Am i clear ? You know what i mean, the way to make start a loop of sample at the end of Bar but for the first time it plays start at the first one and not listen that one after anymore.
Actually i do it by track muting by hand...

Thanks !

From my memory Simlut S. uses programs from main sequence like it would be 2 x 64 tracks with same programs as on main screen, which might be a problem when too many notes are being played.

for 2nd q:

mode 10, press misc > truncate duration: set it to "as played"